Elastic fluid turbine



March 26, 1935.

' Filed June 29, 1954 F. D. COLETTA ELASTIC FLUAID TURBINE 2 Sheets-Sheet l Gttox'negS.

March 26, 1935. F. D. COLETTA ELASTIC FLUID TURBINE Filed June 29, 1934 2 Sheets-Sheet 2 Patented MarlZG, 1935 i ELASTIO FLUID TURBINE FiorintoD. olettapAlfredoChaves, Brazil Application June 29,1934,

Serial No. 733,097'

.. In Brazil July 31, 1933 g claims'V j(c1 25e-16.5)

,The present invention rentes to elastic uuid turbines of the radial ow blade type, and has for an object to provide a simplied construe-V tion with relatively few bearings and wherein the parts are soconstructed that great strength is obtained in a relatively small structure andy wherein a pair of opposed oppositely rotatable rotors are employed with means for taking off the power y'from the rotors and directing the power to a Ycommon shaft driven in one direction.'

Another object of the present invention is to provide an improved thrust means between the oppositely rotatable rotors whereinv the pressure is balanced by the elastic fluid to olfset end thrust on the supporting bearings.

- Another object of the present invention is to provide an improved iiuid distributor for conducting the elastic fluid into the working'charnber uniformly at different points thereof to nsure the even expansion of the uid throughout the chamber and against the variousblades employed. Y

The invention has for a further object an improved mounting vfor the bladeswhich admits of. quick and easy manufacturing and assem bling of the parts of the motor and which provides for strengthening the blades and holding them in their true positions;y

AAmong the .'various other objects and advantages of the invention is to provide'a turbine of this character which mayV easily beV converted for diierent uses and wherein the structureis capable of use vin a turbine wherein but one rotor is used; -andwherein the amount of lpacking required is reduced to a minimum, and a structure which is capable of being coupled in multiple in'various stages oi lowpressures.

Another feature of lthe invention resides in a peculiar construction wherein the'working chamber may be proportioned in cross sectional area to accommodatethe expansionofvarious elastic fluids under various conditions; and

wherein the radial blades may be proportionately,

increased in cross sectional area from the smaller to the larger end ofthe working chamberto utilize to the fullest extent the full pressure-of the fluid during expansion.

With Athe foregoing and other objects in View', the inventionwill be more fullyV described hereinafter, and will be more particularly pointed out in the claims appended hereto. f Y

In the drawingsfwherein like symbolsrefer to like or correspondingparts throughout the several views, Y -1 Y f Figure4 v1 is Aa longitudinal section taken through an elastic fluid turbine constructeda cording to the present '-invention, and showing one means vof coupling the oppositely rotatable rotors to thedrive shaft.Y Y Y lE igure 2 is la, transverse 'medial section taken through the turbine on the line 22 Vof Figure 1 and showing theA concentric rowscf opposed radial blades. j fc 1 Figure 3 is a 'detail Aouter end' view of the fluid distributor, showing the spiralv entrance ports for the incoming iiuid." H ligure'll is a side elevation of Athe same,V and Figure 5 is an inner endV view of the distribue tor.l

VReferring now to ,the'drawings 10 designates a'shaft which may extend throughout the length of the turbine and also,l through the coupling or transmission mechanism associated therewith, as shown `in Figure Keyed `Vto the shaft is the hub '11 of a rotorflZ; The rotor l2 is of substantially discformwith conical outer`v andV inner faces tapering' radially Yfrom the hub 11 and terminating in 'a peripheral rim 13 having an outer :cylindrical bearing surface for' re` ceiving packing thereagainst as will subsequentlyV appear. Y

The outer end of the hub 11 is screw threaded to receive thereon a nut` 14 which abuts a fluid distributor 15, shown in *detail inFigures 3,'4'and 5. 'Ihefdistributor is of cylindrical form and slidf ably nts upon the hub 11 and is provided at its outer end adjacent the nut 14 with an entrance portion comprising a plurality of substantially spiral passagesV 16' opening and iiaring through the peripheral surface of the distributor and terminating at their inner ends in longitudinal passages oropenings 17 disposed in parallel relation to the shaft 10 and adapted'to carry or direct the elastictuidfrom the inlet passages 16 inwardly through the distributor. The hubv V11 is provided at the outer sidej of the rotor12`with an enlargement 18 counterbored about the main portion o f the'hub 1l and receiving therein the inner end ofthe distributc'rj15. The enlargef ment 18 is provided with aplurality of axially extending passages 19 which lead from the openings'l' intheV distributor and extend 'entirely through the rotor l2 and beyond the same in the outer surface" off'the hub 11.` The enlarged por-v tion'18 of the hub, andthe nut 14 are provided with' the packing glands or ribs 20 sealed in a bearing 21 adapted to support the adjacent end of the turbine and it will be vnoted that the ribs are inclined in opposite directions so las toV portion 18 and theY nut 14' and provides therebetween and within the bearing 21 an `annular' intake chamber 22 which communicates with anv intake coupling 23 for the reception of steam or other elastic fluid.

Freely. rotatable on the opposite.end. of Athe shaft and abutting the end ofthe hub V1.1; isaa econd rotor 24 which has an outwardly extending hub 25 freely rotatable on the shaft 10 and which is dished at its inner side and partially closed thereat by an annular rotor plate261whiclii is opposed to the rotor 12 and whichhasacom ical inner face forming Vwith the inner face of the rotor 12 an outwardly flaringijannularworkting chamber. The plate 26 is substantiallyia.part'` of the rotor 24 and is held thereto by bolts 27 or. the like as shown, the bolts 27 being cou'nt'ersunkv in recesses 2S .providedin the outer.- taperingy portion of the rotor 24.. VvAthrust disc. 29.is. disposed inthe cavity. of the. rotor 24 and isethreaded or otherwise suitably securednponthehub ,11. `The thrust disc 29 is providedwithflanfinner concave annular surface opposed-tothe inner side of the rotor: plate 26: and spaced,therefrom.to provide anannularfluidj receivingchamberfor.. setting. up a counter pressure at the back oftheplate 2 6fto\maintain the. same against endwise. thrust f romvtheV rotoiz 12.vv The plateZGmay be strength-V enecl by a pluralityv or annularl ribs.v 30,4 and1 a packing 31 may be interposedbetween the peripheryroi the thrustdisc-29 andthe. innerr wallof the rotor y24 to seal the disc 29 therein andthus sealthe thrust chamber.

`Afiixed-casing. 32 surrounds bothQofthe; rotors and is provided with'an annular exhaust` chamber 33 having` a: desired.- number of exhaust .ports .34

i leading` to exhaust, connections 35 for conduct.-

ing the expended or partially expended. elastic' iluid from the turbine. The rotor. plate 2.6-is provided .withan'outer marginal .rim Sfisimilanto the rim 13, and: these rims 13 andA 36 .are rsealed inthefcasing 32 by. annular' packing glands or rings .37. disposed at. opposite sides .oftherexhaust chamber 33to prevent leakage of the exhaust vfluidI after passingvv outwardly' from. the-working chamber.

Y The rotors carryV concentric radially. .alternate ing: rows ciblades 384with the bladesoffalternate rowscarriedrby. the rotorf12 and the Vbladesior intermediate rows carried bythe r,otor.24 through thewplateV 26.. These bladesv 3,8.. arefpreferably mounted upon backing discs or.` plates..39 which are, suitably. secured against. the inner. opposite facesfof. the rotorsand the blades extendcrosswise of. the .work-ing. chamber.. andare .alternately androppositely inclined. soz as to, oier the.: desired resistance to.` radial .expansiongofithe elastiouid as the. latter. movesradially thrnughtlieworking chamber. The arrangementof the blades 3.8.is shownto. advantage in .Figure 25and.it .willl be.evi. dentthat. jthe erpansionof the, fluid will exert. op..- positev tangential pressures upon.the vblades 33 so astoturnthe rotors in oppositefdirections and With-the. same'relative speed andiorce. 'Ilo facile ita-tet assembling and separation. of the parts, .the casing` 32.* is .provided at. one endl with a. frusto-V 'conical-,sheath 40.- which l is providedrat its` larger endwith anzattaching flange 41'securedzbyfscrews inFigure 11.

The body or main portion of the casing 32 is provided with a suitable opening at its other end iorthe reception of the hub and adjacent parts of the rotor 12. Any suitable means may be employed for reinforcing or strengthening the blades 38, and forthe sake of clearness various portions of .the turbine are omitted as having no part of the present invention but which of course are essential.in the. actual construction and for the maintenanceand operation of the turbine.V

'n Figure 1, however, the hub 25 of the rotor24 is provided with a pinion 42 which meshes with the reverse pinion 43 and the latter is in mesh with'.a'.th.ird;pinion 44 carried upon a countershaft 45. vIheshaft 45 carries a gear wheel 45 which rneshesiwith a second gear wheel 47 keyed orf: otherwisefsecured upon the shaft 10 so that the power. transmitted from the rotor 24 is throughthe train of gears transmitted to the shaft'lO." As the rotor 12 is keyed directly to the shaft lthroughitsf hub,11 thesliraft 10 alsoiis drivenby the rotor '12. The train of, gears is suitably.mountedirrageanboxA orA case 48,` suitable shafts; and bearings being. provided Y for thev varions` pinionsandgearwheels. i s The hub `l1, nut14, rotor l2v with itspartsand thethrustdisc 29make up withthe shaftflfand gear wheel 4T. one of the rotary units ofthe tur..- bine toturnrin` one direction.

The rotor. plate ZGWithitS-parts, and the rotor 24 with its hub 25 and pinion 42 comprise the other. rotary unit of. the turbine toturnginthe other' direction." e. 5 Y v n By v.meansrofl the trainfo gears.43, 44, and 46 theeiffortsof these two :oppositely rotatable units are combined inonek direction and. taken off through the sljlaftlf.z comprising a part, ofone of,

The. elastic fluid enters-the inlet 23.and.passes through.y the ductsa19 into the v-shape working chamber for' contact with. the blades` 38.-and,39 both rotors to` equally distribute the. pressure of the elastic fluid between the walls of the rotors and their. respectiveblades 38' and 39,- which-are disposedr iniy parallel: relation to;- the. axis cfr-the shaft. l0: On. account: ofr thisconstruction :there isno axialthrust but a tangentialrone in thetrue directionof. the rotation-J ofthe shaft 10. 1 The rows of blades carried' by bothrotors areall movable in the, line of impact' and directlytake upV the thrust of the elastic fluid.

For 'thisreasonlthe improved turbine willT delivermorepower withthe same-combustible'mixture thanpresent know-neand used.` turbines, and thisincrease in `power willbeseveral times greater than heretofore.y f f It visvrobviousthat various` changes and modicationsmay-fbe made-inthe detailsofV constructionanddesignioi the abovespecically described embodiment'. of` this-f.inventionwithoutdeparting from the spirit thereof ,3 suchchanges; and-modi-y cations beingv restrictedonly 'bythe .scopeof` the vfollowing clair'nsz--Iv What isfclaimedis -1. Ink an elastic fluidturbine; al shaft, a:rotor rotor, a distributor carriedby the-rst rotor for receiving elasticvfluid under; p resstu'e, saidiirst rotor having passagesy therein leading.4 from the distributor to the. spacebetween therotors, said second rotor having'acavity therein, a thrustdiscconnected to the'iirst rotor and disposedin said cavity .and sealed. `against. the peripheral wall thereof, said second rotor havinga passage leading from the space between the rotors to said cavity rfor receiving elastic fluid in said cavity against the disc and counteracting the thrust between the rotors, and interfitting blades carried by the rotors in parallel relation to Ithe shaft for receiving the elastic fluid thereagainst to turn the rotors in opposite directions.

2. In an elastic fluid turbine, a shaft, a rotor xed to the shaft and `having a hub with longitudinal passages therein, a distributor fitting in the outer end ofthe hub and having passages therein leading to said passages in the hub and provided with spiral peripheral ,inlet openings at its outer end leading tothe passages in the distributor, a bearing sealed about the hub and having an inlet chamber for elastic lfluid under pressure, a second rotor mountedl toturn on the shaft and spaced from the rst rotor and'provided with a ,chamber therein, a disc connected V to the hub of the first rotor and` disposed in saidY ried by the rotors and disposed alternately inl parallel relation to the shaft for convertingv radial pressure of the elastic fluid into,` tangential pressure in opposite directions on' the rotors.

FIORINDU D. coLETTA. 

